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backreferences #14

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sebfisch opened this issue Feb 15, 2010 · 1 comment
Open

backreferences #14

sebfisch opened this issue Feb 15, 2010 · 1 comment
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@sebfisch
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Some implementations support backreferences in regular expressions such that (.*)\1 matches mama and papa. Wikipedia claims that

[...] any implementation which allows the use of backreferences, or implements the various extensions introduced by Perl, must use a backtracking implementation.

It is unclear to me what other "extensions introduced by Perl" are meant here.
@sebfisch
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Maybe restricted backmatching can be adapted?

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@sebfisch